Hernández started his career in 1974 at Estudiantes de La Plata, a club
that he would later manage. He soon earned a reputation as a
skillful attacking midfielder, with a very precise shot. He was
transferred to Italian team Torino F.C. in 1982 for
a then record trasnfer fee for Estudiantes. This record fee allowed
Estudiantes to build an excellent roster, who won championships in
1982 and 1983.

In 1989 Hernández moved to Mexico to play for Cruz Azul but he returned to Argentinos
Juniors in 1990, he then had a season with Huracán in 1991-1992 and another
with Instituto where he
retired from playing in 1993.

Hernández has had a heretofar unsuccessful coaching career,
including Estudiantes, Racing Club, and other teams
in South America, mostly in Ecuador. In February 2007, Hernández was hired
as coach of Club Atlético Banfield from the
Argentine premiership, but he was fired March 16, 2007 after a home
defeat to Estudiantes.

Hernández is also a respected football commentator with
Argentine sports network Torneos y Competencias where he
does in-depth tactical analysis, usually assisted with video clips
and props.